Side-edge backlight module having non-uniformly sized backlight sections and design method thereof

ABSTRACT

A side-edge backlight module having non-uniformly sized backlight sections includes backlight sections that have relative sizes satisfying the condition that the backlight sections have higher ranks are of greater sizes. Ranking the backlight sections is made by conducting an simulation operation for a process of sectionalized lighting of backlight to display liquid crystal panel signals on the basis of uniformly sized backlight sections and conducting analysis of the number of zones where an interference signal appears and distance of the interference signal when each of backlight sections is lit in the simulation operation on the basis of uniformly sized backlight sections and ranking the backlight sections according to strength of cross-talking caused by the interference signal so that a backlight section having less strong cross-talking is set with a higher rank.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a divisional application of co-pending U.S. patent applicationSer. No. 13/698,039, filed on Nov. 14, 2012, which is a national stageof PCT Application Number PCT/CN12/79632, filed on Aug. 3, 2012,claiming foreign priority of Chinese Patent Application Number201210264250.7, filed on Jul. 27, 2012.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to liquid crystal displaying techniques,and in particular to a side-edge backlight module having non-uniformlysized backlight sections and a deign method thereof.

2. The Related Arts

The fast development of LED television is now getting into a new era of3D liquid crystal television. Among the 3D liquid crystal televisions,one of the most commonly used techniques is the shutter glasses 3Ddisplaying technique, in which separate display of signals for left andright eyes is done with sectionalized illumination of backlighting andis used in combination with synchronous flashing of eyeglasses to makethe left and right eyes perceiving different images. The shutter glasses3D displaying technique applies image processing technology to provide avisual effect to human eyes that looks like a stereoscopic movie, whichgenerally comprises alternately supplying signals of left-eye frames andright-eye frames to a liquid crystal panel in order to drive the liquidcrystal panel to separately form left-eye images and right-eye images.This, when combined with illumination of a scanning backlight unit andtiming control of the shutter glasses, allows the left-eye signals andthe right-eye signals to respectively simulate the left eye and theright eye, making a person perceive a 3D image.

However, the 3D liquid crystal display devices have a drawback thatsince the liquid crystal panel does not emit light by itself,backlighting must be provided to serve as a light source. Due to theconsideration of cost factor, sectionalization of the backlight cannotbe made very fine. As shown in FIG. 1, a schematic view showingsectionalized lighting and light leakage of a conventional side-edge LEDbacklight is given. The side-edge LED backlight comprises LED chips thatare arranged along circumferential edges of a liquid crystal panel and alight guide plate is included to allow the LED backlight to be lit in asectionalized manner for conducting light emitting from thecircumferential edges of the liquid crystal display panel through thelight guide plate to reach a central zone of the liquid crystal displaypanel. This provides sufficient backlighting entirely, allowing theliquid crystal display panel to display images. The side-edge LEDbacklight has two advantages. One is that less LED chips can be used andcost is lowered down. The other is that it is possible to make a devicebody thin by not arranging LED modules on the back side of the liquidcrystal panel of LED television but at lateral sides so as to reduce theoverall thickness of the liquid crystal panel and thus make the devicebody extremely thin.

FIG. 1 shows a backlighting section 11 that is of light incidence at aright side short edge. Asymmetry of light leakage is because leakagegets severer with the longer light path. When the backlighting section11 is lit, light leaks to the sections 12 and 13 on the opposite sidesthereof and this causes interference between left-eye and right-eyesignals. In other words, the left eye may perceive the signal for theright eye (or the right eye sees the signal for the left eye) and thismakes image blurred (for the two signals show distributions that overlapin space). The criterion for assessing image blurring is cross-talking,of which a higher value indicates severer interference. Thus, it is animportant issue to reduce cross-talking while maintaining pricecompetitiveness for products.

The cross-talking occurring between a left-eye signal and a right-eyesignal of the conventional shutter glasses 3D displaying technique isdetermined by the technical nature thereof. The backlight module of theconventional shutter glasses liquid crystal 3D display is arranged toform an even number of backlighting sections by dividing a horizontalblock in a vertical direction and scanning is carried out from top tobottom to sequentially control activation and operation time for eachbacklighting section of the backlight module. Image signals (left-eyesignals and right-eye signals) sequentially supply, from top to bottom,driving voltages to each row of the liquid crystal panel. Only afterpixels receive and are charged by the driving voltages, the liquidcrystal panel starts to respond. Due to the design of pixel and theviscosity of liquid crystal, a complete steady state can only be reachedafter a period of liquid crystal response time. Since liquid crystalresponds slowly, image signals are displayed on a liquid crystal panelin a sectionalized scanning fashion. When an image signal scans one ofthe sections of the liquid crystal panel, the corresponding section ofbacklight will be set on and the remaining backlight sections are off.Since leakage exists in the backlight sections, when light leaking froma backlight section corresponding to a left-eye signal irradiates abacklight section corresponding to a right-eye signal (or when lightleaking from a backlight section corresponding to a right-eye signalirradiates a backlight section corresponding to a left-eye signal), theeyes will simultaneously perceive the left-eye image and the right-eyeimage, causing cross-talking. The right-eye signal or the left-eyesignal that causes cross-talking will be referred to as an error signal(or interference signal).

As shown in FIGS. 2A and 2B, schematic views illustrating sectionalizedlighting of backlight for a 46-inch single short edge side-edge LEDtelevision are given. Taking the 46-inch single short edge side-edge LEDtelevision as an example, the backlight module 20 is often divided intoan even number backlight sections, such as four sections, forsectionalized lighting. An edge side backlight section 21, once lit,leaks toward the middle, while a middle backlight section 22, once lit,leaks toward opposite sides.

As shown in FIG. 3, a schematic view showing nine points on a liquidcrystal panel where cross-talking is measured. In FIG. 3, a displayscreen 30 has adjacent sizes of which the dimensions are respectivelydenoted by reference symbols H and V. The nine points, namely point 1,point 2, . . . , and point 9, are arranged according to the relativepositioning relationship as shown in FIG. 3. The locations of point 1,point 2, . . . , and point 9 on the display screen are exactly thelocations on the liquid crystal panel. Measurements are made on aconventional LED television with 46-inch single short edge incidence andfour backlight section scanning and the detected cross-talks at the ninepoints of point 1, point 2, . . . , and point 9 are listed in thefollowing Table 1, which clearly indicates that the cross-talking showsa characteristic of vertical asymmetry, with the upper side being muchseverer than the lower side. In addition, these cross-talks also showhorizontal asymmetry. This is caused by the single short edge incidence,where the further the optic path goes, the severer the leakage will be

TABLE 1 Cross-Talks Measured at Nine Points (46″ single short sideincidence and four backlight section scanning) single short edgeincidence Left 1/9 Middle 1/2 Right 8/9 Upper 1/9 14.99% 8.84% 7.03%Middle 1/2  5.60% 4.51% 3.69% Lower 8/9  8.47% 6.20% 4.81%

Due to the arrangement of backlight sections, timing coordination amongliquid crystal panel signals, glasses signals, and backlight scanningoften result in asymmetry of cross-talking. The data of Table 1 revealthat for a conventional 46-inch single short edge side-edge LEDtelevision, the left-eye signal or the right-eye signal shows an imageof the best quality on the middle portion of the liquid crystal paneland the quality of image displayed on the liquid crystal panel isgenerally unsymmetrical in the vertical direction. The verticalasymmetry of cross-talking shown in Table 1 can be explained with thetiming relationship between the backlight sections and the liquidcrystal panel signals.

As shown in FIG. 4, a schematic view is given to illustrate the timingrelationship (a left-eye signal being used for demonstration) betweenthe backlight sections of a conventional 46-inch single short edgeside-edge LED television and the liquid crystal panel signals (theleft-eye image and the right-eye image signal applied to the liquidcrystal panel). The backlight module is divided, sequentially from topto bottom, into a first backlight section 41, a second backlight section42, a third backlight section 43, and a fourth backlight section 44,which respectively function to illuminate first, second, third, andfourth display sections of a liquid crystal panel 40. In FIG. 4, aleft-eye signal is taken as an example for demonstrating four successivesteps of the operations of the liquid crystal panel 40 and the backlightmodule for displaying liquid crystal panel signals: step a, in which thefirst to third display sections are loaded with a left-eye signal of thecurrent frame and the fourth display section is loaded with a right-eyesignal of the previous frame; the first backlight section 41 is lit toilluminate the first display section and since leakage from the firstbacklight section 41 might undesirably illuminate the fourth displaysection, the right-eye signal of the previous frame loaded in the fourthdisplay section becomes an error signal of cross-talking with theleft-eye signal of the current frame loaded in the first displaysection; since the first display section and the fourth display sectionare spaced from each other by two display sections therebetween and thedistance is great, the cross-talking so caused is minor; step b, inwhich the fourth display section is also loaded with the left-eye signalof the current frame so that at this moment, the liquid crystal panel 40is entirely loaded with the left-eye signal; the second backlightsection 42 is lit to illuminate the second display section; at thismoment, leakage from the second backlight section 42 does not causecross-talking between the left-eye signal and the right-eye signal,providing the best image quality; step c, in which the first displaysection is loaded with a right-eye signal of the next frame and thesecond to fourth display sections are loaded with the left-eye signal ofthe current frame; the third backlight section 43 is lit to illuminatethe third display section; at this moment, the right-eye signal of thenext frame loaded in the first display section becomes an error signalof cross-talking with the left-eye signal of the current frame loaded inthe third display section; since the first display section and the thirddisplay section are only spaced by one display section therebetween andthe distance is short, the cross-talking is severe; and step d, in whichthe first and second display sections are loaded with the right-eyesignal of the next frame and the third and fourth display sections areloaded with the left-eye signal of the current frame; the fourthbacklight section 44 is lit to illuminate the fourth display section; atthis moment, the right-eye signal of the next frame loaded in the firstand second display sections becomes an error of cross-talking with theleft-eye signal of the current frame loaded in the fourth displaysection; since the first and second display sections are spaced from thefourth display section by only one display section therebetween and thedistance is short, the cross-talking is severe. The severeness ofcross-talking is different when different backlight section is lit.During the entire process of 3D displaying, the liquid crystal panel 40repeats the processes of loading a right-eye signal (the previousframe), loading a left-eye signal (the current frame), loading aright-eye signal (the next frame), loading a left-eye signal, loading aright-eye signal, and so on. Since the conventional side-edge backlightsections are set up for sections of even number, when an error signalappears, the influence it imposes on the upper and lower sides isdifferent. In this example, the error signal generated when a backlightsection is lit is closer to the upper side and the upper sidecross-talking is severe in the liquid crystal panel 40 so that thecross-talking of the liquid crystal panel 40 is unsymmetrical in thevertical direction. Adjustment may be directly made on the liquidcrystal panel signal to make backlight section lit at a center of theliquid crystal panel signal. Although the cross-talking of the liquidcrystal panel 40 can be made substantially symmetric in the verticaldirection, yet due to the number of the backlight sections being even,the quality of image at the center position will be sacrificed andcross-talking gets serious.

SUMMARY OF THE INVENTION

Thus, an object of the present invention is to improve cross-talking byusing non-uniformly sized backlight sections in order to enhancedisplaying quality.

To achieve the object, the present invention provides a side-edgenon-uniform backlight module having non-uniformly sized backlightsections. The side-edge backlight module having non-uniformly sizedbacklight sections comprises backlight sections that have relative sizessatisfying the condition that the backlight sections have higher ranksare of greater sizes, wherein ranking the backlight sections is made byconducting an simulation operation for a process of sectionalizedlighting of backlight to display liquid crystal panel signals on thebasis of uniformly sized backlight sections according to predeterminedliquid crystal panel signals and backlight scanning timing andconducting analysis of the number of zones where an interference signalappears and distance of the interference signal when each of backlightsections is lit in the simulation operation on the basis of uniformlysized backlight sections and ranking the backlight sections according tostrength of cross-talking caused by the interference signal when each ofthe backlight sections is lit so that a backlight section having lessstrong cross-talking is set with a higher rank.

Wherein, the side-edge backlight module comprises first, second, third,fourth, and fifth backlight sections, among which the third backlightsection has the greatest size, the second and fourth backlight sectionshave the second greatest size, and the first and fifth backlightsections have the third greatest size.

Wherein, the side-edge backlight module comprises first, second, third,and fourth backlight sections, among which the second backlight sectionhas the greatest size, the first backlight section has the secondgreatest size, the third backlight section has the third greatest size,and the fourth backlight section has the fourth greatest size.

Wherein, the side-edge backlight module is of single short edgeincidence.

Wherein, the side-edge backlight module is of dual short edge incidence.

The present invention also provided a side-edge backlight module havingnon-uniformly sized backlight sections, which comprises backlightsections that have relative sizes satisfying the condition that thebacklight sections have higher ranks are of greater sizes, whereinranking the backlight sections is made by conducting an simulationoperation for a process of sectionalized lighting of backlight todisplay liquid crystal panel signals on the basis of uniformly sizedbacklight sections according to predetermined liquid crystal panelsignals and backlight scanning timing and conducting analysis of thenumber of zones where an interference signal appears and distance of theinterference signal when each of backlight sections is lit in thesimulation operation on the basis of uniformly sized backlight sectionsand ranking the backlight sections according to strength ofcross-talking caused by the interference signal when each of thebacklight sections is lit so that a backlight section having less strongcross-talking is set with a higher rank;

wherein the side-edge backlight module comprises first, second, third,fourth, and fifth backlight sections, among which the third backlightsection has the greatest size, the second and fourth backlight sectionshave the second greatest size, and the first and fifth backlightsections have the third greatest size; and

wherein the side-edge backlight module is of single short edgeincidence.

The present invention also provides a method for designing a side-edgebacklight module having non-uniformly sized backlight sections, whichcomprises the following steps:

Step 1: conducting an simulation operation for a process ofsectionalized lighting of backlight to display liquid crystal panelsignals on the basis of uniformly sized backlight sections according topredetermined liquid crystal panel signals and backlight scanningtiming;

Step 2: conducting analysis of the number of zones where an interferencesignal appears and distance of the interference signal when each ofbacklight sections is lit in the simulation operation on the basis ofuniformly sized backlight sections and ranking the backlight sectionsaccording to strength of cross-talking caused by the interference signalwhen each of the backlight sections is lit so that a backlight sectionhaving less strong cross-talking is set with a higher rank; and

Step 3: providing a higher-rank backlight section with a relativelylarger size.

Wherein, the side-edge backlight module is of single short edgeincidence.

Wherein, the side-edge backlight module is of dual short edge incidence.

The present invention provides a side-edge backlight module havingnon-uniformly sized backlight sections and a design method thereof,which use liquid crystal panel signals and backlight scanning timing todetermine the influence on cross-talking caused by each of the backlightsections in order to improve cross-talking and enhance displayingquality through modification of the relative sizes of the backlightsections.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution, as well as beneficial advantages, of the presentinvention will be apparent from the following detailed description of anembodiment of the present invention, with reference to the attacheddrawings. In the drawings:

FIG. 1 is a schematic view showing sectionalized lighting and leakage ofa conventional side-edge LED backlight;

FIGS. 2A and 2B are schematic views illustrating sectionalized backlightlighting of a 46-inch single edge side-edge LED television;

FIG. 3 is a schematic view showing the sites of 9 points on a displayscreen for measuring cross-talking;

FIG. 4 is a schematic view showing timing relationship (for left-eyesignal) between backlight sections of a 46-inch single short edgeside-edge LED television and liquid crystal panel signals;

FIGS. 5A and 5B are diagrams illustrating liquid crystal panel signalsand backlight scanning timing when the number of backlight sections isodd;

FIGS. 6A and 6B are diagrams illustrating liquid crystal panel signalsand backlight scanning timing when the number of backlight sections iseven;

FIG. 7A is a schematic view illustrating relative sizes of the backlightsections that are of an odd number for a preferred embodiment of theside-edge backlight module having non-uniformly sized backlight sectionsaccording to the present invention;

FIG. 7B is a schematic view illustrating relative sizes of the backlightsections that are of an even number for another preferred embodiment ofthe side-edge backlight module having non-uniformly sized backlightsections according to the present invention; and

FIG. 8 is a flow chart illustrating a design method for a side-edgebacklight module having non-uniformly sized backlight sections.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention uses non-uniformly sized backlight sections toimprove cross-talking and enhance quality of displaying. Referring toFIG. 8, a flow chart is given to illustrate a design method for aside-edge backlight module having non-uniformly sized backlightsections. The method comprises the following steps:

Step 1: conducting an simulation operation for a process ofsectionalized lighting of backlight to display liquid crystal panelsignals on the basis of uniformly sized backlight sections according topredetermined liquid crystal panel signals and backlight scanningtiming;

Step 2: conducting analysis of the number of zones where an interferencesignal appears and distance of the interference signal when each ofbacklight sections is lit in the simulation operation on the basis ofuniformly sized backlight sections and ranking the backlight sectionsaccording to strength of cross-talking caused by the interference signalwhen each of the backlight sections is lit so that a backlight sectionhaving less strong cross-talking is set with a higher rank; and

Step 3: providing a higher-rank backlight section with a relativelylarger size.

The method is applicable to for example single short edge incidencebacklight module or dual short edge incidence backlight module fordesigning side-edge backlight module having non-uniformly sizedbacklight sections.

The design method, as well as a side-edge backlight module havingnon-uniformly sized backlight sections designed with such a method, willbe described with reference to FIGS. 5A, 5B, 6A, 6B, 7A, and 7B.

FIGS. 5A and 5B are diagrams showing liquid crystal panel signals andbacklight scanning timing where the number of backlight sections is odd.As shown in FIG. 5A, the number of sections used is odd and a specificexample of four is given. The left-eye and right-eye liquid crystalpanel signals are shown sequentially arranged. The ranges of theleft-eye and right-eye signals are indicated by braces. As shown in FIG.5A, the simulation operation is conducted according to Step 1, wherewhen the backlight is lit, lighting can be selected to be constantlymaintained at the center of the liquid crystal panel signal in order tominimize cross-talking. For a backlight module that is composed of 2n+1(n being a natural number) backlight sections, a liquid crystal panelsignal that is correspondingly divided into 2n+1 sections. Maintaininglighting at the center of the liquid crystal panel signal means lightingthe n+1th section of the liquid crystal panel signal. In this way, thedistance from the previous or next interference signal is the greatest,making the cross-talking minimized. As shown in FIG. 5B, during thecycling process of the liquid crystal panel signals, the first, second,and third sections of backlight are lit separately. The location wherethe backlight section is lit is indicated by hatching. It is noted fromthe drawing that the locations, as well as the number thereof, where theinterference signals occur are different. In other words, the strengthof cross-talking so caused is different, leading to asymmetry ofcross-talking. The strength of cross-talking is identical when thesecond and fourth backlight sections are lit and the strength ofcross-talking is also identical when the first and fifth backlightsections are lit. Thus, based on the location where the interferencesignal occurs, the present invention follows Step 2 to rank thebacklight sections according to the strength of the interference signaland then follows Step 3 to modify the relative sizes of the backlightsections by decreasing the size of a backlight section that causes aseverer interference signal so as to reduce the strength of theinterference caused thereby and thus making the displaying qualityapproaching symmetry. Thus, a side-edge backlight module havingnon-uniformly sized backlight sections according to the presentinvention is completed.

As shown in FIG. 7A, a schematic view is given to illustrate relativesizes of the backlight sections that are of an odd number for apreferred embodiment of the side-edge backlight module havingnon-uniformly sized backlight sections according to the presentinvention. In the embodiment, the number of the backlight sections isfive. The side-edge backlight module comprises, in sequence, first,second, third, fourth, and fifth backlight sections, and the relativesizes of the backlight sections are modified according to the presentinvention so that the sizes of the backlight sections are increased fromthe smallest at the ends to the greatest in the center and are madesymmetric in the up-down direction. Among all the backlight sections,the third backlight section has the greatest size, the second and fourthbacklight sections have the second greatest size, and the first andfifth backlight sections have the third greatest size. Although thepresent invention provides only an example of five backlight sectionsfor illustration, yet the same process can be applied to differentnumbers of backlight sections to make an analysis for determining therelative sizes. A simulation may then be conducted for minor adjustment.Adopting the side-edge backlight module having non-uniformly sizedbacklight sections according to the present invention and makingdisplaying according to the predetermined liquid crystal panel signalsand backlight scanning timing can apparently improve cross-talking andenhance quality of displaying.

FIGS. 6A and 6B are diagrams showing liquid crystal panel signals andbacklight scanning timing where the number of backlight sections iseven. As shown in FIG. 6A, the number of sections used is even and aspecific example of four is given. The left-eye and right-eye liquidcrystal panel signals are shown sequentially arranged. The ranges of theleft-eye and right-eye signals are indicated by braces. In FIG. 6A, thesections are of an even number and the location where the backlightsection is lit is indicated by hatching. When the backlight is lit,lighting can be selected to be constantly maintained at the secondsection of the liquid crystal panel signal in order to minimizecross-talking at the center. For a backlight module that is composed of2n (n being a natural number) backlight sections, lighting of thebacklight can be selectively maintained at the nth section of the liquidcrystal panel signal, namely being as close to the center of the liquidcrystal panel signal as possible, so as to minimize cross-talking at thecenter. As shown in FIG. 6B, during the cycling process of the liquidcrystal panel signals, the locations, as well as the number thereof,where the interference signals occur are different, leading to asymmetryof cross-talking. FIG. 6B shows four different displaying timing (havingan even number of sections: four sections), where the first, second, andthird sections of backlight are lit separately (the second section beingfree of interference signal so that the section size can be thegreatest). Again, the previously described steps of the presentinvention are followed to rank the strengths of interference signaloccurring when each of the backlight sections is lit in order to modifythe relatively sizes of the backlight sections and thus obtaining therelative sizes of the backlight sections shown in FIG. 7B for an evennumber of backlight sections. In the embodiment, the number of thebacklight sections is four, where the side-edge backlight modulecomprises, in sequence, first, second, third, and fourth backlightsections. Among all the backlight sections, the second backlight sectionhas the greatest size, the first backlight section has the secondgreatest size, the third backlight section has the third greatest size,and the fourth backlight section has the fourth greatest size.

In summary, the present invention provides a side-edge backlight modulehaving non-uniformly sized backlight sections and a design methodthereof, which use liquid crystal panel signals and backlight scanningtiming to determine the influence on cross-talking caused by each of thebacklight sections in order to improve cross-talking and enhancedisplaying quality through modification of the relative sizes of thebacklight sections.

Based on the description given above, those having ordinary skills ofthe art may easily contemplate various changes and modifications of thetechnical solution and technical ideas of the present invention and allthese changes and modifications are considered within the protectionscope of right for the present invention.

What is claimed is:
 1. A side-edge backlight module, comprising a numberof backlight sections that are arranged side by side in a firstdirection to collectively define a planar smooth surface having alateral edge with interfacing lines between the backlight sectionslocated on the planar surface and substantially perpendicular to thelateral edge, the backlight sections receiving light projecting from thelateral edge in a second direction that is substantially perpendicularto the first direction and parallel to the planar surface, the backlightsections being adapted to correspond to and respectively illuminatesections of a display panel that receive image signals to be displayedwith the light projecting from the lateral edge in the second direction,the backlight sections being ranked according to a predetermined ruleand having non-uniform sizes such that the sizes of the backlightsections respectively correspond to the ranks of the backlight sections,wherein the rank of each specific one of the backlight sections isdetermined by strength of an interference signal resulting fromcross-talking among the display panel sections when the specific one ofthe backlight sections is lit so that a backlight section has lessstrong cross-talking is set with a higher rank and the backlightsections are ranked according to the strengths of cross-talking that thebacklight sections exhibit, wherein the sizes of the backlight sectionsare each variable and determined according to the ranks of the backlightsections.
 2. The side-edge backlight module as claimed in claim 1,wherein the number of backlight sections of the side-edge backlightmodule comprise first, second, third, fourth, and fifth backlightsections, which are grouped into first group that comprises the thirdbacklight section, a second group that comprises the second and fourthbacklight section, and a third group that comprises a first and fifthbacklight section, where the backlight sections of the groups havenon-uniform sizes, among which the third backlight section of the firstgroup has the greatest size, the second and fourth backlight sections ofthe second group have the second greatest size, and the first and fifthbacklight sections of the third group have the third greatest size. 3.The side-edge backlight module as claimed in claim 1, wherein the numberof backlight sections of the side-edge backlight module comprise first,second, third, and fourth backlight sections, among which the secondbacklight section has the greatest size, the first backlight section hasthe second greatest size, the third backlight section has the thirdgreatest size, and the fourth backlight section has the fourth greatestsize.
 4. The side-edge backlight module as claimed in claim 1, whereinthe side-edge backlight module is of single short edge incidence.
 5. Theside-edge backlight module as claimed in claim 1, wherein the side-edgebacklight module is of dual short edge incidence.
 6. A side-edgebacklight module, comprising a number of backlight sections that arearranged side by side in a first direction to collectively define aplanar smooth surface having a lateral edge with interfacing linesbetween the backlight sections located on the planar surface andsubstantially perpendicular to the lateral edge, the backlight sectionsreceiving light projecting from the lateral edge in a second directionthat is substantially perpendicular to the first direction and parallelto the planar surface, the backlight sections being adapted tocorrespond to and respectively illuminate sections of a display panelthat receive image signals to be displayed with the light projectingfrom the lateral edge in the second direction, the backlight sectionsbeing ranked according to a predetermined rule and having non-uniformsizes such that the sizes of the backlight sections respectivelycorrespond to the ranks of the backlight sections, wherein the rank ofeach specific one of the backlight sections is determined by strength ofan interference signal resulting from cross-talking among the displaypanel sections when the specific one of the backlight sections is lit sothat a backlight section has less strong cross-talking is set with ahigher rank and the backlight sections are ranked according to thestrengths of cross-talking that the backlight sections exhibit; whereinthe sizes of the backlight sections are each variable and determinedaccording to the ranks of the backlight sections; wherein the number ofbacklight sections of the side-edge backlight module comprise first,second, third, fourth, and fifth backlight sections, which are groupedinto first group that comprises the third backlight section, a secondgroup that comprises the second and fourth backlight section, and athird group that comprises a first and fifth backlight section, wherethe backlight sections of the groups have non-uniform sizes, among whichthe third backlight section of the first group has the greatest size,the second and fourth backlight sections of the second group have thesecond greatest size, and the first and fifth backlight sections of thethird group have the third greatest size; and wherein the side-edgebacklight module is of single short edge incidence.